Tower or mast



H. COHEN Feb. 13, 1945.

TOWER OR MAST Filed May 29, 1943 2 Sheets-Sheet 2.

IN V EN TOR. HaroZcZ Cohen Patented Feb. 13, 1945 I TWER on Mas'r maneaten, Elizabeth, the.

Applicationhday 29}, 1943, Serial No. 489,021- g -21:15am. (cuss-26:

f A turther object is the provision of a unit of the. indicated,fcharacter' which when collapsed maybe transported from place to'place,requir me butflittle Spae-m transit.' w t A further obj. t'is,theprovi'sion of .a portable unit consistlngoi a telescopic tower ormast and means ioryextending and collapsing the same.

none. When the sections lll "are in the retracted relation; the tower ormast is then retracted or collapsed. The sections 10 maybe extended orraised one at a time and when the sections l'il'are retained in theextended relation; by means here- 'j' inaiterfdescrlbed, the tower ormast is then extended for use asshownin Fig. 1. e

' In order to facilitate? the telescopic or sliding movement oit'hesections and to giverigidity and stability to the tower or mast when thesec tions are extended, each of the sections it on the A furthercbjectisthejprovision in a tower or mast oi telescopicisecti'ons and'improv'edmeans for retaining said sections extended and to men'- itatethetelescopic movement ofthe sections;

Other objects ot the invention as well as the outside of the lower endthereof has two spaced series of well rounded'protuberances orprojections 12; Any suitable number of the protuberances maybe providedin e'ach'series, there being foul-in the present instance spacedequi-distantly.

In order to -retain thesections III in the extended relation and toenable them to be retracted "there is provided identical means for adcombination, construction and operation of the parts will be apparentfrom the following description and the accompanying, drawings, in,

which- Fig. 1 is va view in elevation of a field unit embodying thefeatures of the invention.

Fig. 2 is an enlarged view in elevation of the unit and showing thetower or mast lowered or collapsed. e

. Fig. 3 is a sectional view taken on the line 3 3 of Fig. 2. I

Fig. 4 is an enlarged fragmentary side view showing certain features. v

Fig. 5 is a sectional view taken on the line 5--5 of Fig. 4.

Fig. 6 is an enlarged fragmentary vertical section illustrating themanner in which sections of the tower or mast are raised and further howthey are retained in the extended relation.

Fig. '7 is a fragmentary side view showing certain features.

Fig.8 is a sectional view taken on the line 8-8 of Fig. '7.

The tower or mast of the unit is composed of relatively extensible andretractable sections 10 with a base section II. 'These sections aretubular and round in cross-section in the present instance. The'sections are telescopically related so as to slide one within the otherstarting with the uppermost untilthey are nested or retracted as shownin Fig. 2. The sections are of progressively increased length so thatone projects beyond the next when the sections are retracted, thusleaving an upper projecting portion for each section exceptthe basesection II which requires joining sections'which" are contiguous to eachother or fit one within the other. For this purpose said means consistsof two sets of detachable cross-bars [3. The cross-bars of each setextend transversely through the sections l0 parallel to each other, saidsections being provided with slots to receive them. The cross-bars ofone set are disposed at a right. angle to those in the'other set, andfurther, one cross-bar of one set inter- I venes with those of the otherset, as shown most clearly in Figs. 4 to 8. Wedge shape keys I4 extendthrough the projecting ends of the cross-'- bars of each set, saidcross-bars having slots to receive them. The keys I4 bear against theside of the related outer section and thus firmly hold the partsassembled. The keys M as applied to the cross-bars l3 serveadvantageously for guying the tower or mast when extended. As

shown in Fig. 1, guy lines l5 are with the keys M respectively, therebeing a hole IS in each key to receive the upper end of the line. Theguy lines branch outwardly and downwardly in four radial groups due tothe disposition of the keys [4. Thelower ends of the lines of each groupare clamped and anchored in the ground by a single anchor I! to whichthe lines-are connected.

It is to be understood the sections ID are joined or coupled one toanother in the raising operation in which the uppermost section is firstraised or lifted from its retracted position after which the cross-barsand keys required are applied, and this procedure is followed inconnection with the other sections to bring about the erection of thetower or mast. In lowering or retracting the tower or mast the reverseoperations are carried out starting with the lowermost section I0.

In order to raise and lower the sections In for the stated purposes,mechanism as follows or its equivalent is provided. Extensible andretractable posts I8 are fixed upright on a base IS. The mast section IIis also fixed upright on said base I9. The posts 18 are braced to thesection II in any suitable manner. Pulleys 20 are supported on a bracket2| on the section II, and pulleys 23 are mounted on each of the postsl8. Grapples 24 are connected with rings 25 and a cable 26 has one endthereof connected with each of said rings. Each cable 26 is trained overa set of the pulleys, namely, two pulleys 23 and one of the The grapples24 cooperate with pulleys 20. hook-like members or lugs 21 atdiametrically opposite sides of each of the upper projectinge'nd withthe lugs 21 and a pullin'g'force'is exerted on the cables 26 by anysuitable means to raise or lift the sectionsone at a time so that, theymay of each section H1. The grapples 24 are engaged 1 means to renderthe unit readily portable. The

unit may be attached to a trailer so as to be mechanism mounted on thelowermost section of the tower or. mast which cooperates with said firstmeans to extend the tower or mast by rais gaged with the next sectionwithout requiring an operator to climb. The guy lines 15 may beconnected with the keys M of the uppermost sets and the lines l5 arecarried up as the tower or mast is extended to the limit, The lines arethen anchored.

v When the unit is collapsed it may be transported from place to placein an auto, truck or the like. Also, the base is may have traction ingone of said sections at a time, and detachable means to retain thesections in extended relation, said mechanism including a grappleengageable with said first means.

' 2.'A tower or mast composed or relatively ex- .tensible andretractable slidably associated sections, said sections starting withthe base section being of progressivelyincreased length so that oneprojects beyond the next when the sections are retracted, powermechanism adapted to exert an upward pulling force, said mechanism

